NumNodes:   8
NumGroups:  15
NumLevels:  4
LevelSizes: 8 4 2 1
G[0][1]{0}
G[0][1]{1}
G[0][1]{2}
G[0][1]{3}
G[0][1]{4}
G[0][1]{5}
G[0][1]{6}
G[0][1]{7}
G[1][2]{0,1}
G[1][2]{2,3}
G[1][2]{4,5}
G[1][2]{6,7}
G[2][4]{0,1,2,3}
G[2][4]{4,5,6,7}
G[3][8]{0,1,2,3,4,5,6,7}